Suppressor Build 9mm (form 1 complete) pic heavy

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  • Benjamin

    Marksman
    Rating - 100%
    9   0   0
    Jun 30, 2009
    283
    28
    Columbus, IN
    Give me feedback and recommendations before I build. You can comment on material choice but I've already ordered the 316 so that's pretty much the way I'm going.

    Assembly:

    9mm w boostewrAssembly3.jpg
    Piston and coil spring retainer:
    piston encasement.jpg piston encasement 2.jpg

    Piston:
    suppressor piston.jpg suppressor piston 2.jpg

    Endcap:
    1.37 9mm end cap.jpg



    Needed:
    Welder (preferably tig)
    All I know about welding is that I'm not trying this on my MIG.
    Engraver

    PM me if you offer these services near Columbus. Won't need for a few weeks.


    Alright gentleman the form 1 is back and complete. I've had the form 1 for a while but am finally getting around to starting the build. All the turning will be done on my lathe. I may make the piston in two pieces then press fit and weld them together. There will be a coil spring in the piston assembly. Thought about making a 5/8x24 direct thread adapter. Will likely have to add some space between the blast chamber rear wall and the piston retainer piece threads. I don't know a way to thread up flush against a wall.

    Proposed specs:

    Build material: 316 stainless
    Aperture: 0.394inches~10mm
    OD: 1.375 inches
    ID: 1.25 inches
    Wall thickness: 0.0625 inches
    Thread: 1/2x28
    Baffles: 60 degree
    Construction: full circumference welds
    Length: TBD

    Obviously I could change threads by switching out the piston.

    A couple changes I'm thinking about making:

    1. Flattening out the tips of the baffles to prevent wear.

    1.375 9mm baffle tip.jpg

    2. Clipping baffles.
    Not my photos (found online)
    D8knZVN.jpg wMcc0p6.jpg

    3. Stepped baffles rather than smooth.
    4. Slotting or drilling the piston.
    Not my photos (found online)
    universal-piston-adapter2.jpg

    4. Non uniform baffle spacing (decreasing baffles spacing towards the end of the can)
     

    Floivanus

    Sharpshooter
    Rating - 100%
    2   0   0
    Dec 6, 2016
    612
    28
    La crosse
    I would make a wide shouldered 60* baffle and not make them like you have pictured. Also drop that DHC clip or the other style and just go with a single round bottomed scoop on each baffle, approximately half of bore width (.406” bore gets a .200 or so scoop)

    according to people with an actual meter (pewscience, eccomachine and silencerstudent) wide shoulder cones are the way to go. Look up eccomachines work to see what I mean by that shape.
     

    BR8818

    Sharpshooter
    Rating - 100%
    12   0   0
    Nov 20, 2018
    716
    63
    Anderson
    I agree with above post on a pistol caliber I'd do the big single scoop and align them. I did the dhc on my 30cal silencer it made a big difference.
     

    STFU

    Master
    Site Supporter
    Rating - 100%
    16   0   0
    Sep 30, 2015
    2,421
    113
    Hamilton County
    I used the DHC on my Form1 308 can.
    Besides being the quietest can I have (300BLK), I do not have to "align the DHCs" to avoid severe POI shifts.
     

    pinshooter45

    Master
    Rating - 100%
    3   0   0
    Sep 1, 2009
    1,962
    48
    Indianapolis
    Give me feedback and recommendations before I build. You can comment on material choice but I've already ordered the 316 so that's pretty much the way I'm going.

    Assembly:

    View attachment 130492
    Piston and coil spring retainer:
    View attachment 130502 View attachment 130503

    Piston:
    View attachment 130505 View attachment 130506

    Endcap:
    View attachment 130504



    Needed:
    Welder (preferably tig)
    All I know about welding is that I'm not trying this on my MIG.
    Engraver

    PM me if you offer these services near Columbus. Won't need for a few weeks.


    Alright gentleman the form 1 is back and complete. I've had the form 1 for a while but am finally getting around to starting the build. All the turning will be done on my lathe. I may make the piston in two pieces then press fit and weld them together. There will be a coil spring in the piston assembly. Thought about making a 5/8x24 direct thread adapter. Will likely have to add some space between the blast chamber rear wall and the piston retainer piece threads. I don't know a way to thread up flush against a wall.

    Proposed specs:

    Build material: 316 stainless
    Aperture: 0.394inches~10mm
    OD: 1.375 inches
    ID: 1.25 inches
    Wall thickness: 0.0625 inches
    Thread: 1/2x28
    Baffles: 60 degree
    Construction: full circumference welds
    Length: TBD

    Obviously I could change threads by switching out the piston.

    A couple changes I'm thinking about making:

    1. Flattening out the tips of the baffles to prevent wear.

    View attachment 130497

    2. Clipping baffles.
    Not my photos (found online)
    View attachment 130498 View attachment 130500

    3. Stepped baffles rather than smooth.
    4. Slotting or drilling the piston.
    Not my photos (found online)
    View attachment 130501

    4. Non uniform baffle spacing (decreasing baffles spacing towards the end of the can)
    If you are still looking for someone to do the welding, My son is an EXCELLENT welder and is set up to weld anything weldable! He is in the Heavy Truck Repair Biz and has been for years. We are in the Indy area and south central Indiana. PM me if this works for you and I'll see what we can arrange...
     

    churchmouse

    I still care....Really
    Emeritus
    Rating - 100%
    187   0   0
    Dec 7, 2011
    191,809
    152
    Speedway area

    Angrysauce

    Sharpshooter
    Rating - 100%
    6   0   0
    Dec 30, 2020
    519
    93
    Kokomo
    If you are still looking for someone to do the welding, My son is an EXCELLENT welder and is set up to weld anything weldable! He is in the Heavy Truck Repair Biz and has been for years. We are in the Indy area and south central Indiana. PM me if this works for you and I'll see what we can arrange...
    Unless your son is an 07/02 this is a no no. The Form 1 allows the "Maker" to create the suppressor. There's been issue taken up with using someone else's shop to make NFA items. Having someone other than the "Maker" do machining processes on a Form 1, while not having an SOT... Draw your own conclusions.
    The rules are purposefully convoluted and I don't like them, but soliciting breaking them on the internet might be unwise.
    My :twocents:
     

    Floivanus

    Sharpshooter
    Rating - 100%
    2   0   0
    Dec 6, 2016
    612
    28
    La crosse
    Unless your son is an 07/02 this is a no no. The Form 1 allows the "Maker" to create the suppressor. There's been issue taken up with using someone else's shop to make NFA items. Having someone other than the "Maker" do machining processes on a Form 1, while not having an SOT... Draw your own conclusions.
    The rules are purposefully convoluted and I don't like them, but soliciting breaking them on the internet might be unwise.
    My :twocents:
    Anyone can machine/work on a form1 silencer/sbr/whatever given the “maker” listed on the form1 is present.

    But in this case, if the welding is to be done on the “piston” that isn’t an NFA controlled item anyway...
     

    Benjamin

    Marksman
    Rating - 100%
    9   0   0
    Jun 30, 2009
    283
    28
    Columbus, IN
    Unless your son is an 07/02 this is a no no. The Form 1 allows the "Maker" to create the suppressor. There's been issue taken up with using someone else's shop to make NFA items. Having someone other than the "Maker" do machining processes on a Form 1, while not having an SOT... Draw your own conclusions.
    The rules are purposefully convoluted and I don't like them, but soliciting breaking them on the internet might be unwise.
    My :twocents:
    If the applicant on the Form 1 lacks the skill, ability, and/or equipment to manufacture the NFA firearm, the applicant, after receipt of the approved Form 1, can have the firearm created or modified at a premises other than shown on the approved Form 1 as long as the creation or modification was done under the direct oversight of the applicant, thus having the applicant retain custody and control of the firearm. If the location is outside the applicant’s State and the firearm being made is a short barreled rifle, short barreled shotgun, destructive device, or an unserviceable machinegun which is being reactivated, the applicant will also need to request permission to transport the firearm interstate as required by 27 CFR 478.28.

    In addition to being an amateur machinist I also happen to have a doctorate in law.
     

    Benjamin

    Marksman
    Rating - 100%
    9   0   0
    Jun 30, 2009
    283
    28
    Columbus, IN
    522EDD9A-091E-4CED-8106-5BBA2A9196E6.jpeg
     

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